help me,UnavailableShardsException

[yoyokeen]

[189]: index [ep], type [x], id [WBJ06200B4], message [UnavailableShardsException[[ep][0] Primary shard is not active or isn't assigned to a known node. Timeout: [1m], request: org.elasticsearch.action.bulk.BulkShardRequest@62d55891]]

there have Unassigned node in ES.

how to fix it, that is on live.

[yoyokeen]

missing some shards in my ES and havnet backup. how to retrieve them.